Aga Khan's 37-carat emerald sets $9 million record
Aga Khan's 37-carat emerald sets $9 million record

A 37-carat square emerald, once owned by the Aga Khan, fetched nearly nine million dollars at a Geneva auction on Tuesday, becoming the most expensive green gemstone in the world. The Cartier diamond and emerald brooch, which was sold by Christies and can also be worn as a pendant, has now...